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prep a metal roof for painting

I have a job coming up soon I could us some advice on. I am going to be washing a house and supposed to be prepping a metal roof for a painter to paint, is there anything I can use that will rough up the metal surface enough to be ready to paint over other that using good ol sandpaper and a whole lot of time that I don't have...any suggestions?

I know TSP is used for paint prep a lot. check manufacturer's recommendation for repainting. How are they painting? if it's electrostatic I don't think they need to rough it up if it's in bad enough shape it needs a repaint.